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Abstract. It is shown that a new cutoff at small scattering angle should be introduced for constant relative velocity meanwhile a new cutoff on the velocity increment should be introduced for varied relative velocity based on the effective collision conditions. It is found that the Coulomb logarithm should be reduced to half of the well-known result. Consequently, the Fokker-Planck coefficients are modified and applicable to both weakly and moderately coupled plasmas. The relaxation times increase and the cross-field electrical resistivity, electron diffusion and ion thermal conductivity are reduced to half level for Maxwellian scatters. The non-Maxwellian effect can furthermore modify the Fokker-Planck coefficients, increase the relaxation times and reduce the cross-field transport coefficients.
IAEA 2001
